/* * lms283gf05.c -- support for Samsung LMS283GF05 LCD * * Copyright (c) 2009 Marek Vasut * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include struct lms283gf05_state { struct spi_device *spi; struct lcd_device *ld; }; struct lms283gf05_seq { unsigned char reg; unsigned short value; unsigned char delay; }; /* Magic sequences supplied by manufacturer, for details refer to datasheet */ static const struct lms283gf05_seq disp_initseq[] = { /* REG, VALUE, DELAY */ { 0x07, 0x0000, 0 }, { 0x13, 0x0000, 10 }, { 0x11, 0x3004, 0 }, { 0x14, 0x200F, 0 }, { 0x10, 0x1a20, 0 }, { 0x13, 0x0040, 50 }, { 0x13, 0x0060, 0 }, { 0x13, 0x0070, 200 }, { 0x01, 0x0127, 0 }, { 0x02, 0x0700, 0 }, { 0x03, 0x1030, 0 }, { 0x08, 0x0208, 0 }, { 0x0B, 0x0620, 0 }, { 0x0C, 0x0110, 0 }, { 0x30, 0x0120, 0 }, { 0x31, 0x0127, 0 }, { 0x32, 0x0000, 0 }, { 0x33, 0x0503, 0 }, { 0x34, 0x0727, 0 }, { 0x35, 0x0124, 0 }, { 0x36, 0x0706, 0 }, { 0x37, 0x0701, 0 }, { 0x38, 0x0F00, 0 }, { 0x39, 0x0F00, 0 }, { 0x40, 0x0000, 0 }, { 0x41, 0x0000, 0 }, { 0x42, 0x013f, 0 }, { 0x43, 0x0000, 0 }, { 0x44, 0x013f, 0 }, { 0x45, 0x0000, 0 }, { 0x46, 0xef00, 0 }, { 0x47, 0x013f, 0 }, { 0x48, 0x0000, 0 }, { 0x07, 0x0015, 30 }, { 0x07, 0x0017, 0 }, { 0x20, 0x0000, 0 }, { 0x21, 0x0000, 0 }, { 0x22, 0x0000, 0 } }; static const struct lms283gf05_seq disp_pdwnseq[] = { { 0x07, 0x0016, 30 }, { 0x07, 0x0004, 0 }, { 0x10, 0x0220, 20 }, { 0x13, 0x0060, 50 }, { 0x13, 0x0040, 50 }, { 0x13, 0x0000, 0 }, { 0x10, 0x0000, 0 } }; static void lms283gf05_reset(unsigned long gpio, bool inverted) { gpio_set_value(gpio, !inverted); mdelay(100); gpio_set_value(gpio, inverted); mdelay(20); gpio_set_value(gpio, !inverted); mdelay(20); } static void lms283gf05_toggle(struct spi_device *spi, const struct lms283gf05_seq *seq, int sz) { char buf[3]; int i; for (i = 0; i < sz; i++) { buf[0] = 0x74; buf[1] = 0x00; buf[2] = seq[i].reg; spi_write(spi, buf, 3); buf[0] = 0x76; buf[1] = seq[i].value >> 8; buf[2] = seq[i].value & 0xff; spi_write(spi, buf, 3); mdelay(seq[i].delay); } } static int lms283gf05_power_set(struct lcd_device *ld, int power) { struct lms283gf05_state *st = lcd_get_data(ld); struct spi_device *spi = st->spi; struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev); if (power <= FB_BLANK_NORMAL) { if (pdata) lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted); lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); } else { lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq)); if (pdata) gpio_set_value(pdata->reset_gpio, pdata->reset_inverted); } return 0; } static struct lcd_ops lms_ops = { .set_power = lms283gf05_power_set, .get_power = NULL, }; static int lms283gf05_probe(struct spi_device *spi) { struct lms283gf05_state *st; struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev); struct lcd_device *ld; int ret = 0; if (pdata != NULL) { ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio, GPIOF_DIR_OUT | (!pdata->reset_inverted ? GPIOF_INIT_HIGH : GPIOF_INIT_LOW), "LMS285GF05 RESET"); if (ret) return ret; } st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state), GFP_KERNEL); if (st == NULL) return -ENOMEM; ld = devm_lcd_device_register(&spi->dev, "lms283gf05", &spi->dev, st, &lms_ops); if (IS_ERR(ld)) return PTR_ERR(ld); st->spi = spi; st->ld = ld; spi_set_drvdata(spi, st); /* kick in the LCD */ if (pdata) lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted); lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); return 0; } static struct spi_driver lms283gf05_driver = { .driver = { .name = "lms283gf05", }, .probe = lms283gf05_probe, }; module_spi_driver(lms283gf05_driver); MODULE_AUTHOR("Marek Vasut "); MODULE_DESCRIPTION("LCD283GF05 LCD"); MODULE_LICENSE("GPL v2"); ='selected'>unified
authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-30 19:27:10 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-31 09:13:49 -0500
commit79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch)
tree370efda701f03cccf21e02bb1fdd3b852547d75c /drivers/usb/host/ehci-q.c
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'drivers/usb/host/ehci-q.c')